Bump sigs.k8s.io/controller-runtime to v0.14.4 (#5507)

* Bump sigs.k8s.io/controller-runtime to v0.14.4

* Update gofmt

vendor/k8s.io/component-base/metrics/buckets.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// DefBuckets is a wrapper for prometheus.DefBuckets
+var DefBuckets = prometheus.DefBuckets
+
+// LinearBuckets is a wrapper for prometheus.LinearBuckets.
+func LinearBuckets(start, width float64, count int) []float64 {
+	return prometheus.LinearBuckets(start, width, count)
+}
+
+// ExponentialBuckets is a wrapper for prometheus.ExponentialBuckets.
+func ExponentialBuckets(start, factor float64, count int) []float64 {
+	return prometheus.ExponentialBuckets(start, factor, count)
+}
+
+// MergeBuckets merges buckets together
+func MergeBuckets(buckets ...[]float64) []float64 {
+	result := make([]float64, 1)
+	for _, s := range buckets {
+		result = append(result, s...)
+	}
+	return result
+}

vendor/k8s.io/component-base/metrics/collector.go

@@ -45,9 +45,9 @@ type StableCollector interface {
 	HiddenMetrics() []string
 }
 
-// BaseStableCollector which implements almost all of the methods defined by StableCollector
+// BaseStableCollector which implements almost all methods defined by StableCollector
 // is a convenient assistant for custom collectors.
-// It is recommend that inherit BaseStableCollector when implementing custom collectors.
+// It is recommended to inherit BaseStableCollector when implementing custom collectors.
 type BaseStableCollector struct {
 	descriptors  map[string]*Desc // stores all descriptors by pair<fqName, Desc>, these are collected from DescribeWithStability().
 	registerable map[string]*Desc // stores registerable descriptors by pair<fqName, Desc>, is a subset of descriptors.
@@ -62,7 +62,7 @@ func (bsc *BaseStableCollector) DescribeWithStability(ch chan<- *Desc) {
 }
 
 // Describe sends all descriptors to the provided channel.
-// It intend to be called by prometheus registry.
+// It intended to be called by prometheus registry.
 func (bsc *BaseStableCollector) Describe(ch chan<- *prometheus.Desc) {
 	for _, d := range bsc.registerable {
 		ch <- d.toPrometheusDesc()

vendor/k8s.io/component-base/metrics/counter.go

@@ -44,7 +44,7 @@ func NewCounter(opts *CounterOpts) *Counter {
 
 	kc := &Counter{
 		CounterOpts: opts,
-		lazyMetric:  lazyMetric{},
+		lazyMetric:  lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	kc.setPrometheusCounter(noop)
 	kc.lazyInit(kc, BuildFQName(opts.Namespace, opts.Subsystem, opts.Name))
@@ -129,7 +129,7 @@ func NewCounterVec(opts *CounterOpts, labels []string) *CounterVec {
 		CounterVec:     noopCounterVec,
 		CounterOpts:    opts,
 		originalLabels: labels,
-		lazyMetric:     lazyMetric{},
+		lazyMetric:     lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	cv.lazyInit(cv, fqName)
 	return cv

vendor/k8s.io/component-base/metrics/features/kube_features.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package features
+
+import (
+	"k8s.io/component-base/featuregate"
+)
+
+const (
+	// owner: @logicalhan
+	// kep: https://kep.k8s.io/3466
+	// alpha: v1.26
+	ComponentSLIs featuregate.Feature = "ComponentSLIs"
+)
+
+func featureGates() map[featuregate.Feature]featuregate.FeatureSpec {
+	return map[featuregate.Feature]featuregate.FeatureSpec{
+		ComponentSLIs: {Default: false, PreRelease: featuregate.Alpha},
+	}
+}
+
+// AddFeatureGates adds all feature gates used by this package.
+func AddFeatureGates(mutableFeatureGate featuregate.MutableFeatureGate) error {
+	return mutableFeatureGate.Add(featureGates())
+}

vendor/k8s.io/component-base/metrics/gauge.go

@@ -46,7 +46,7 @@ func NewGauge(opts *GaugeOpts) *Gauge {
 
 	kc := &Gauge{
 		GaugeOpts:  opts,
-		lazyMetric: lazyMetric{},
+		lazyMetric: lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	kc.setPrometheusGauge(noop)
 	kc.lazyInit(kc, BuildFQName(opts.Namespace, opts.Subsystem, opts.Name))
@@ -115,7 +115,7 @@ func NewGaugeVec(opts *GaugeOpts, labels []string) *GaugeVec {
 		GaugeVec:       noopGaugeVec,
 		GaugeOpts:      opts,
 		originalLabels: labels,
-		lazyMetric:     lazyMetric{},
+		lazyMetric:     lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	cv.lazyInit(cv, fqName)
 	return cv

vendor/k8s.io/component-base/metrics/histogram.go

@@ -23,19 +23,6 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 )
 
-// DefBuckets is a wrapper for prometheus.DefBuckets
-var DefBuckets = prometheus.DefBuckets
-
-// LinearBuckets is a wrapper for prometheus.LinearBuckets.
-func LinearBuckets(start, width float64, count int) []float64 {
-	return prometheus.LinearBuckets(start, width, count)
-}
-
-// ExponentialBuckets is a wrapper for prometheus.ExponentialBuckets.
-func ExponentialBuckets(start, factor float64, count int) []float64 {
-	return prometheus.ExponentialBuckets(start, factor, count)
-}
-
 // Histogram is our internal representation for our wrapping struct around prometheus
 // histograms. Summary implements both kubeCollector and ObserverMetric
 type Histogram struct {
@@ -52,7 +39,7 @@ func NewHistogram(opts *HistogramOpts) *Histogram {
 
 	h := &Histogram{
 		HistogramOpts: opts,
-		lazyMetric:    lazyMetric{},
+		lazyMetric:    lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	h.setPrometheusHistogram(noopMetric{})
 	h.lazyInit(h, BuildFQName(opts.Namespace, opts.Subsystem, opts.Name))
@@ -119,7 +106,7 @@ func NewHistogramVec(opts *HistogramOpts, labels []string) *HistogramVec {
 		HistogramVec:   noopHistogramVec,
 		HistogramOpts:  opts,
 		originalLabels: labels,
-		lazyMetric:     lazyMetric{},
+		lazyMetric:     lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	v.lazyInit(v, fqName)
 	return v

vendor/k8s.io/component-base/metrics/legacyregistry/registry.go

@@ -20,6 +20,7 @@ import (
 	"net/http"
 
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 
 	"k8s.io/component-base/metrics"
@@ -44,10 +45,9 @@ var (
 )
 
 func init() {
-	//nolint:staticcheck // SA1019 - replacement function still calls prometheus.NewProcessCollector().
-	RawMustRegister(prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}))
-	//nolint:staticcheck // SA1019 - replacement function still calls prometheus.NewGoCollector().
-	RawMustRegister(prometheus.NewGoCollector())
+	RawMustRegister(collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}))
+	RawMustRegister(collectors.NewGoCollector(collectors.WithGoCollectorRuntimeMetrics(collectors.MetricsAll)))
+	defaultRegistry.RegisterMetaMetrics()
 }
 
 // Handler returns an HTTP handler for the DefaultGatherer. It is

vendor/k8s.io/component-base/metrics/metric.go

@@ -72,6 +72,7 @@ type lazyMetric struct {
 	markDeprecationOnce sync.Once
 	createOnce          sync.Once
 	self                kubeCollector
+	stabilityLevel      StabilityLevel
 }
 
 func (r *lazyMetric) IsCreated() bool {
@@ -149,6 +150,7 @@ func (r *lazyMetric) Create(version *semver.Version) bool {
 	if r.IsHidden() {
 		return false
 	}
+
 	r.createOnce.Do(func() {
 		r.createLock.Lock()
 		defer r.createLock.Unlock()
@@ -159,6 +161,13 @@ func (r *lazyMetric) Create(version *semver.Version) bool {
 			r.self.initializeMetric()
 		}
 	})
+	sl := r.stabilityLevel
+	deprecatedV := r.self.DeprecatedVersion()
+	dv := ""
+	if deprecatedV != nil {
+		dv = deprecatedV.String()
+	}
+	registeredMetrics.WithLabelValues(string(sl), dv).Inc()
 	return r.IsCreated()
 }
 

vendor/k8s.io/component-base/metrics/opts.go

@@ -66,9 +66,15 @@ func BuildFQName(namespace, subsystem, name string) string {
 type StabilityLevel string
 
 const (
+	// INTERNAL metrics have no stability guarantees, as such, labels may
+	// be arbitrarily added/removed and the metric may be deleted at any time.
+	INTERNAL StabilityLevel = "INTERNAL"
 	// ALPHA metrics have no stability guarantees, as such, labels may
 	// be arbitrarily added/removed and the metric may be deleted at any time.
 	ALPHA StabilityLevel = "ALPHA"
+	// BETA metrics are governed by the deprecation policy outlined in by
+	// the control plane metrics stability KEP.
+	BETA StabilityLevel = "BETA"
 	// STABLE metrics are guaranteed not be mutated and removal is governed by
 	// the deprecation policy outlined in by the control plane metrics stability KEP.
 	STABLE StabilityLevel = "STABLE"

vendor/k8s.io/component-base/metrics/prometheus/feature/metrics.go

@@ -0,0 +1,53 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package feature
+
+import (
+	"context"
+
+	k8smetrics "k8s.io/component-base/metrics"
+	"k8s.io/component-base/metrics/legacyregistry"
+)
+
+var (
+	// featureInfo is a Prometheus Gauge metrics used for recording the enablement of a k8s feature.
+	featureInfo = k8smetrics.NewGaugeVec(
+		&k8smetrics.GaugeOpts{
+			Namespace:      "kubernetes",
+			Name:           "feature_enabled",
+			Help:           "This metric records the data about the stage and enablement of a k8s feature.",
+			StabilityLevel: k8smetrics.ALPHA,
+		},
+		[]string{"name", "stage"},
+	)
+)
+
+func init() {
+	legacyregistry.MustRegister(featureInfo)
+}
+
+func ResetFeatureInfoMetric() {
+	featureInfo.Reset()
+}
+
+func RecordFeatureInfo(ctx context.Context, name string, stage string, enabled bool) {
+	value := 0.0
+	if enabled {
+		value = 1.0
+	}
+	featureInfo.WithContext(ctx).WithLabelValues(name, stage).Set(value)
+}

vendor/k8s.io/component-base/metrics/prometheus/slis/metrics.go

@@ -0,0 +1,76 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package slis
+
+import (
+	"context"
+	k8smetrics "k8s.io/component-base/metrics"
+)
+
+type HealthcheckStatus string
+
+const (
+	Success HealthcheckStatus = "success"
+	Error   HealthcheckStatus = "error"
+)
+
+type HealthcheckType string
+
+var (
+	// healthcheck is a Prometheus Gauge metrics used for recording the results of a k8s healthcheck.
+	healthcheck = k8smetrics.NewGaugeVec(
+		&k8smetrics.GaugeOpts{
+			Namespace:      "kubernetes",
+			Name:           "healthcheck",
+			Help:           "This metric records the result of a single healthcheck.",
+			StabilityLevel: k8smetrics.ALPHA,
+		},
+		[]string{"name", "type"},
+	)
+
+	// healthchecksTotal is a Prometheus Counter metrics used for counting the results of a k8s healthcheck.
+	healthchecksTotal = k8smetrics.NewCounterVec(
+		&k8smetrics.CounterOpts{
+			Namespace:      "kubernetes",
+			Name:           "healthchecks_total",
+			Help:           "This metric records the results of all healthcheck.",
+			StabilityLevel: k8smetrics.ALPHA,
+		},
+		[]string{"name", "type", "status"},
+	)
+)
+
+func Register(registry k8smetrics.KubeRegistry) {
+	registry.Register(healthcheck)
+	registry.Register(healthchecksTotal)
+}
+
+func ResetHealthMetrics() {
+	healthcheck.Reset()
+	healthchecksTotal.Reset()
+}
+
+func ObserveHealthcheck(ctx context.Context, name string, healthcheckType string, status HealthcheckStatus) error {
+	if status == Success {
+		healthcheck.WithContext(ctx).WithLabelValues(name, healthcheckType).Set(1)
+	} else {
+		healthcheck.WithContext(ctx).WithLabelValues(name, healthcheckType).Set(0)
+	}
+
+	healthchecksTotal.WithContext(ctx).WithLabelValues(name, healthcheckType, string(status)).Inc()
+	return nil
+}

vendor/k8s.io/component-base/metrics/prometheus/slis/registry.go

@@ -0,0 +1,27 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package slis
+
+import (
+	"k8s.io/component-base/metrics"
+)
+
+var (
+	// Registry exposes the SLI registry so that additional SLIs can be
+	// added on a per-component basis.
+	Registry = metrics.NewKubeRegistry()
+)

vendor/k8s.io/component-base/metrics/prometheus/slis/routes.go

@@ -0,0 +1,53 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package slis
+
+import (
+	"net/http"
+	"sync"
+
+	"k8s.io/component-base/metrics"
+)
+
+var (
+	installOnce          = sync.Once{}
+	installWithResetOnce = sync.Once{}
+)
+
+type mux interface {
+	Handle(path string, handler http.Handler)
+}
+
+type SLIMetrics struct{}
+
+// Install adds the DefaultMetrics handler
+func (s SLIMetrics) Install(m mux) {
+	installOnce.Do(func() {
+		Register(Registry)
+		m.Handle("/metrics/slis", metrics.HandlerFor(Registry, metrics.HandlerOpts{}))
+	})
+}
+
+type SLIMetricsWithReset struct{}
+
+// Install adds the DefaultMetrics handler
+func (s SLIMetricsWithReset) Install(m mux) {
+	installWithResetOnce.Do(func() {
+		Register(Registry)
+		m.Handle("/metrics/slis", metrics.HandlerWithReset(Registry, metrics.HandlerOpts{}))
+	})
+}

vendor/k8s.io/component-base/metrics/prometheus/workqueue/metrics.go

@@ -39,34 +39,39 @@ const (
 
 var (
 	depth = k8smetrics.NewGaugeVec(&k8smetrics.GaugeOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      DepthKey,
-		Help:      "Current depth of workqueue",
+		Subsystem:      WorkQueueSubsystem,
+		Name:           DepthKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "Current depth of workqueue",
 	}, []string{"name"})
 
 	adds = k8smetrics.NewCounterVec(&k8smetrics.CounterOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      AddsKey,
-		Help:      "Total number of adds handled by workqueue",
+		Subsystem:      WorkQueueSubsystem,
+		Name:           AddsKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "Total number of adds handled by workqueue",
 	}, []string{"name"})
 
 	latency = k8smetrics.NewHistogramVec(&k8smetrics.HistogramOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      QueueLatencyKey,
-		Help:      "How long in seconds an item stays in workqueue before being requested.",
-		Buckets:   k8smetrics.ExponentialBuckets(10e-9, 10, 10),
+		Subsystem:      WorkQueueSubsystem,
+		Name:           QueueLatencyKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "How long in seconds an item stays in workqueue before being requested.",
+		Buckets:        k8smetrics.ExponentialBuckets(10e-9, 10, 10),
 	}, []string{"name"})
 
 	workDuration = k8smetrics.NewHistogramVec(&k8smetrics.HistogramOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      WorkDurationKey,
-		Help:      "How long in seconds processing an item from workqueue takes.",
-		Buckets:   k8smetrics.ExponentialBuckets(10e-9, 10, 10),
+		Subsystem:      WorkQueueSubsystem,
+		Name:           WorkDurationKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "How long in seconds processing an item from workqueue takes.",
+		Buckets:        k8smetrics.ExponentialBuckets(10e-9, 10, 10),
 	}, []string{"name"})
 
 	unfinished = k8smetrics.NewGaugeVec(&k8smetrics.GaugeOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      UnfinishedWorkKey,
+		Subsystem:      WorkQueueSubsystem,
+		Name:           UnfinishedWorkKey,
+		StabilityLevel: k8smetrics.ALPHA,
 		Help: "How many seconds of work has done that " +
 			"is in progress and hasn't been observed by work_duration. Large " +
 			"values indicate stuck threads. One can deduce the number of stuck " +
@@ -74,16 +79,18 @@ var (
 	}, []string{"name"})
 
 	longestRunningProcessor = k8smetrics.NewGaugeVec(&k8smetrics.GaugeOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      LongestRunningProcessorKey,
+		Subsystem:      WorkQueueSubsystem,
+		Name:           LongestRunningProcessorKey,
+		StabilityLevel: k8smetrics.ALPHA,
 		Help: "How many seconds has the longest running " +
 			"processor for workqueue been running.",
 	}, []string{"name"})
 
 	retries = k8smetrics.NewCounterVec(&k8smetrics.CounterOpts{
-		Subsystem: WorkQueueSubsystem,
-		Name:      RetriesKey,
-		Help:      "Total number of retries handled by workqueue",
+		Subsystem:      WorkQueueSubsystem,
+		Name:           RetriesKey,
+		StabilityLevel: k8smetrics.ALPHA,
+		Help:           "Total number of retries handled by workqueue",
 	}, []string{"name"})
 
 	metrics = []k8smetrics.Registerable{

vendor/k8s.io/component-base/metrics/registry.go

@@ -32,10 +32,35 @@ import (
 var (
 	showHiddenOnce      sync.Once
 	disabledMetricsLock sync.RWMutex
-	showHidden          atomic.Value
+	showHidden          atomic.Bool
 	registries          []*kubeRegistry // stores all registries created by NewKubeRegistry()
 	registriesLock      sync.RWMutex
 	disabledMetrics     = map[string]struct{}{}
+
+	registeredMetrics = NewCounterVec(
+		&CounterOpts{
+			Name:           "registered_metric_total",
+			Help:           "The count of registered metrics broken by stability level and deprecation version.",
+			StabilityLevel: ALPHA,
+		},
+		[]string{"stability_level", "deprecated_version"},
+	)
+
+	disabledMetricsTotal = NewCounter(
+		&CounterOpts{
+			Name:           "disabled_metric_total",
+			Help:           "The count of disabled metrics.",
+			StabilityLevel: ALPHA,
+		},
+	)
+
+	hiddenMetricsTotal = NewCounter(
+		&CounterOpts{
+			Name:           "hidden_metric_total",
+			Help:           "The count of hidden metrics.",
+			StabilityLevel: ALPHA,
+		},
+	)
 )
 
 // shouldHide be used to check if a specific metric with deprecated version should be hidden
@@ -67,6 +92,7 @@ func SetDisabledMetric(name string) {
 	disabledMetricsLock.Lock()
 	defer disabledMetricsLock.Unlock()
 	disabledMetrics[name] = struct{}{}
+	disabledMetricsTotal.Inc()
 }
 
 // SetShowHidden will enable showing hidden metrics. This will no-opt
@@ -87,7 +113,7 @@ func SetShowHidden() {
 // is enabled. While the primary usecase for this is internal (to determine
 // registration behavior) this can also be used to introspect
 func ShouldShowHidden() bool {
-	return showHidden.Load() != nil && showHidden.Load().(bool)
+	return showHidden.Load()
 }
 
 // Registerable is an interface for a collector metric which we
@@ -129,6 +155,12 @@ type KubeRegistry interface {
 	// Reset invokes the Reset() function on all items in the registry
 	// which are added as resettables.
 	Reset()
+	// RegisterMetaMetrics registers metrics about the number of registered metrics.
+	RegisterMetaMetrics()
+	// Registerer exposes the underlying prometheus registerer
+	Registerer() prometheus.Registerer
+	// Gatherer exposes the underlying prometheus gatherer
+	Gatherer() prometheus.Gatherer
 }
 
 // kubeRegistry is a wrapper around a prometheus registry-type object. Upon initialization
@@ -160,6 +192,16 @@ func (kr *kubeRegistry) Register(c Registerable) error {
 	return nil
 }
 
+// Registerer exposes the underlying prometheus.Registerer
+func (kr *kubeRegistry) Registerer() prometheus.Registerer {
+	return kr.PromRegistry
+}
+
+// Gatherer exposes the underlying prometheus.Gatherer
+func (kr *kubeRegistry) Gatherer() prometheus.Gatherer {
+	return kr.PromRegistry
+}
+
 // MustRegister works like Register but registers any number of
 // Collectors and panics upon the first registration that causes an
 // error.
@@ -250,6 +292,7 @@ func (kr *kubeRegistry) trackHiddenCollector(c Registerable) {
 	defer kr.hiddenCollectorsLock.Unlock()
 
 	kr.hiddenCollectors[c.FQName()] = c
+	hiddenMetricsTotal.Inc()
 }
 
 // trackStableCollectors stores all custom collectors.
@@ -329,9 +372,14 @@ func newKubeRegistry(v apimachineryversion.Info) *kubeRegistry {
 	return r
 }
 
-// NewKubeRegistry creates a new vanilla Registry without any Collectors
-// pre-registered.
+// NewKubeRegistry creates a new vanilla Registry
 func NewKubeRegistry() KubeRegistry {
 	r := newKubeRegistry(BuildVersion())
 	return r
 }
+
+func (r *kubeRegistry) RegisterMetaMetrics() {
+	r.MustRegister(registeredMetrics)
+	r.MustRegister(disabledMetricsTotal)
+	r.MustRegister(hiddenMetricsTotal)
+}

vendor/k8s.io/component-base/metrics/summary.go

@@ -49,7 +49,7 @@ func NewSummary(opts *SummaryOpts) *Summary {
 
 	s := &Summary{
 		SummaryOpts: opts,
-		lazyMetric:  lazyMetric{},
+		lazyMetric:  lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	s.setPrometheusSummary(noopMetric{})
 	s.lazyInit(s, BuildFQName(opts.Namespace, opts.Subsystem, opts.Name))
@@ -118,7 +118,7 @@ func NewSummaryVec(opts *SummaryOpts, labels []string) *SummaryVec {
 	v := &SummaryVec{
 		SummaryOpts:    opts,
 		originalLabels: labels,
-		lazyMetric:     lazyMetric{},
+		lazyMetric:     lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	v.lazyInit(v, fqName)
 	return v

vendor/k8s.io/component-base/metrics/timing_histogram.go

@@ -57,7 +57,7 @@ func NewTestableTimingHistogram(nowFunc func() time.Time, opts *TimingHistogramO
 	h := &TimingHistogram{
 		TimingHistogramOpts: opts,
 		nowFunc:             nowFunc,
-		lazyMetric:          lazyMetric{},
+		lazyMetric:          lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	h.setPrometheusHistogram(noopMetric{})
 	h.lazyInit(h, BuildFQName(opts.Namespace, opts.Subsystem, opts.Name))
@@ -136,7 +136,7 @@ func NewTestableTimingHistogramVec(nowFunc func() time.Time, opts *TimingHistogr
 		TimingHistogramOpts: opts,
 		nowFunc:             nowFunc,
 		originalLabels:      labels,
-		lazyMetric:          lazyMetric{},
+		lazyMetric:          lazyMetric{stabilityLevel: opts.StabilityLevel},
 	}
 	v.lazyInit(v, fqName)
 	return v
@@ -177,6 +177,9 @@ func (v *TimingHistogramVec) WithLabelValuesChecked(lvs ...string) (GaugeMetric,
 		v.LabelValueAllowLists.ConstrainToAllowedList(v.originalLabels, lvs)
 	}
 	ops, err := v.TimingHistogramVec.GetMetricWithLabelValues(lvs...)
+	if err != nil {
+		return noop, err
+	}
 	return ops.(GaugeMetric), err
 }
 

vendor/k8s.io/component-base/metrics/value.go

@@ -47,6 +47,16 @@ func NewLazyConstMetric(desc *Desc, valueType ValueType, value float64, labelVal
 	return prometheus.MustNewConstMetric(desc.toPrometheusDesc(), valueType.toPromValueType(), value, labelValues...)
 }
 
+// NewConstMetric is a helper of NewConstMetric.
+//
+// Note: If the metrics described by the desc is hidden, the metrics will not be created.
+func NewConstMetric(desc *Desc, valueType ValueType, value float64, labelValues ...string) (Metric, error) {
+	if desc.IsHidden() {
+		return nil, nil
+	}
+	return prometheus.NewConstMetric(desc.toPrometheusDesc(), valueType.toPromValueType(), value, labelValues...)
+}
+
 // NewLazyMetricWithTimestamp is a helper of NewMetricWithTimestamp.
 //
 // Warning: the Metric 'm' must be the one created by NewLazyConstMetric(),

vendor/k8s.io/component-base/metrics/wrappers.go

@@ -145,6 +145,12 @@ type Gatherer interface {
 	prometheus.Gatherer
 }
 
+// Registerer is the interface for the part of a registry in charge of registering
+// the collected metrics.
+type Registerer interface {
+	prometheus.Registerer
+}
+
 // GaugeFunc is a Gauge whose value is determined at collect time by calling a
 // provided function.
 //